1. Department of Experimental Physics Faculty of Fundamental Problems of Technology Wrocław University of Science and Technology Wybrzeże Wyspiańskiego 27 50-370 Wrocław Poland
2. Department of Theoretical Physics Faculty of Fundamental Problems of Technology Wrocław University of Science and Technology Wybrzeże Wyspiańskiego 27 50-370 Wrocław Poland
3. Institute of Nanostructure Technologies and Analytics (INA) Center for Interdisciplinary Nanostructure Science and Technology (CINSaT) University of Kassel Heinrich-Plett-Str. 40 34132 Kassel Germany